Engineering Science -Mount Lavinia, LK

Ratmalana, L.K.National W., LK, M.Town Water & Lavinia, L.K.Engineerin, 1982. Basic sanitation training manual excreta disposal and sewerage, Colombo, Sri Lanka: Engineering-Science. Available at: https://es.ircwash.org/sites/default/files/320-82BA-1352.pdf.